38．A．report                     B．luck                       C．helpful                   D．help

37．A．clouds                    B．weather                  C．pictures                  D．trees

36．A．it                           B．one                        C．ones                       D．them

35．A．that                        B．for                         C．where                     D．how

34．A．satellites                 B．pictures                  C．weather                  D．space

33．A．so                          B．because                   C．even                       D．but

32．A．reach                      B．arrive                            C．get                         D．go

31．A．help                       B．to help                    C．helped                    D．helping

30．My mother finds ________ great fun to learn to drive a car．

A．it                           B．this                        C．the                        D．what

Now satellites are  31  to forecast（预报）the weather．They are in space，and they can  32  any part of the world．The satellites take pictures of the atmosphere（大气），  33  this is where the weather forms（形成）．They send these  34  to the weather stations．So meteorologists （气象学家）can see the weather of any part of the world．From the pictures，the scientists can often say  35  the weather will change．

Today，nearly five hundred weather stations in sixty countries receive satellite pictures．When they receive new pictures，the meteorologists compare them with earlier  36   ．Perhaps they may find that the clouds have changed during the last few hours．This may mean that the  37  on the ground may soon change，too．In their next weather forecast，the meteorologists can say this．

So the weather satellites are a great  38  to the meteorologists．  39   satellites were invented，the scientists could forecast the weather for about 24 or 48 hours．Now they call make good forecasts for three or five days．Soon，perhaps，they may   40   forecast the weather for a week or more ahead（提前）．

29．It’s raining ________．We have to stay at home instead of going fishing．

A．badly                            B．hardly                    C．heavily                  D．strongly